﻿#if (TARGETS_NETCOREAPP && LESSTHAN_NET50) || NETSTANDARD20_OR_GREATER

using System;

// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

namespace System.Diagnostics.CodeAnalysis
{
	/// <summary>
	/// Indicates that certain members on a specified <see cref="Type"/> are accessed dynamically,
	/// for example through <see cref="Reflection"/>.
	/// </summary>
	/// <remarks>
	/// <para>
	/// This allows tools to understand which members are being accessed during the execution
	/// of a program.
	/// </para>
	/// <para>This attribute is valid on members whose type is <see cref="Type"/> or <see cref="string"/>.</para>
	/// <para>
	/// When this attribute is applied to a location of type <see cref="string"/>, the assumption is
	/// that the string represents a fully qualified type name.
	/// </para>
	/// <para>
	/// If the attribute is applied to a method it's treated as a special case and it implies
	/// the attribute should be applied to the "this" parameter of the method. As such the attribute
	/// should only be used on instance methods of types assignable to System.Type (or string, but no methods
	/// will use it there).
	/// </para>
	/// </remarks>
	[AttributeUsage(
		AttributeTargets.Field | AttributeTargets.ReturnValue | AttributeTargets.GenericParameter | AttributeTargets.Parameter
			| AttributeTargets.Property | AttributeTargets.Method | AttributeTargets.Class | AttributeTargets.Interface
			| AttributeTargets.Struct, Inherited = false)]
	internal sealed class DynamicallyAccessedMembersAttribute : Attribute
	{
		/// <summary>
		/// Initializes a new instance of the <see cref="DynamicallyAccessedMembersAttribute"/> class
		/// with the specified member types.
		/// </summary>
		/// <param name="memberTypes">The types of members dynamically accessed.</param>
		public DynamicallyAccessedMembersAttribute(DynamicallyAccessedMemberTypes memberTypes) => MemberTypes = memberTypes;

		/// <summary>
		/// Gets the <see cref="DynamicallyAccessedMemberTypes"/> which specifies the type
		/// of members dynamically accessed.
		/// </summary>
		public DynamicallyAccessedMemberTypes MemberTypes { get; }
	}
}

#endif